May 5 2010 - 18:43:00 May 5 2010 Cardiac Muscle AKA...

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May 5 2010 Cardiac Muscle     AKA myocardium Creates blood pressure when contracted (PV=nRT) Properties: Shorter myofibers Vs. Skeletal Junctions between cells o =Intercalcated Disc o Contains: Desmosomes (protein connection) Gap Junctions (moves electrical signal between cells for  coordinated movement) Cell Contraction Action potential on plasma membrane “Calcium induced calcium release” Voltage gated calcium channels in transverse tubules Extracellular calcium to cytoplasm in cell o Binds troponin   contraction o Ligand-gated calcium channels in sarcoplasmic reticulum   more  calcium *Repeat o Consequence: [Calcium]       Strength/Force Ex: Tube of toothpaste.  When full, you do not need much force  for movement.  When empty, you need a lot of force for  movement. To end contraction = 
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May 5 2010 - 18:43:00 May 5 2010 Cardiac Muscle AKA...

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